/**
 * @description: <br/>
 * @date: 2023/12/8 11:14<br/>
 * @author Jy-Jk<br/>
 */
class Student(name: String, age: Int, val num: String, val grade: Int) : Person(name, age), Study {
    constructor(name: String, age: Int, num: String) : this(name, age, num, 1)
    constructor(name: String, age: Int) : this(name, age, "001")

    override fun study() {
    }

    override fun eat() {
    }

    fun studentInfo() = println("$name's age is $age, grade is $grade, his num is $num, he study is working hard! ")
}